Diffuser



FIG. 1 is a front view of a diffuser of the present design;

FIG. 2 is a rear view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a left side perspective view thereof;

FIG. 6 is a right side perspective view thereof; and,

FIG. 7 is a rear, bottom, left perspective view thereof. 

CLAIM The ornamental design for a diffuser, as shown and described. 